You must not agree to do it. Don't weaken.

你们一定不能同意做这件事。别心软。

《牛津词典》

I think she'll agree to do it but in any event, all she can say is 'no'.

我想她会同意做的，但无论怎样，她只能说“不”。

《牛津词典》

People agree to do something.

人在做一件事情上达成共识。

youdao

"I think that you're going to see some significant additional sanctions imposed by the international community, assuming that the Iranians don't change course and agree to do the things they signed up to do at the beginning of October,".

VOA: standard.2009.12.12

It's illegal, so they can't sign that as a contract, but they they can just agree to do it.

因为是违法的,合同也就无效了,不过他们可以私下达成默契

耶鲁公开课 - 博弈论课程节选

because I do have elements that I really agree with such as you have to do community service.

因为这当中有我十分赞同的部分，比如你必须参加社区服务。

选美比赛的好处 - SpeakingMax英语口语达人

We do it by getting state legislatures and their governors to agree to do it.

FORBES: Networks

Congress and the administration seem hard-pressed to agree to do anything constructive about it, however.

CNN: Don't pull plug on the long-term unemployed

Will what the eurozone is able to agree to do be enough to keep it together?

FORBES: Kicking The Can Down The Road